Mediaset, which is controlled by former prime minister Silvio Berlusconi's family, is stuck in a legal feud with Vivendi after the French media group pulled the plug on a deal to buy the broadcaster's pay-TV Premium in 2016.

Vivendi, which declined to comment on the court decision, transferred 19.19 percent of its shareholding in Mediaset to the Simon Fiduciaria trust in April after Italy's watchdog told it to cut its stake in either Telecom Italia or Mediaset to comply with antitrust regulations.

In June, Mediaset closed the door of its June AGM to the trust, preventing it from voting.

In response, Simon Fiduciaria launched a legal challenge asking that two of the decisions taken at the AGM - one related to the establishment of an incentive and retention plan, and another to stock options - be suspended.

(Additional reporting by Gwenaelle Barzic in Paris; editing by Alexander Smith)

By Francesca Landini